Rotary engine.



PATENTBD MAR; 21,-1905.

L. BERGMAN. ROTARY ENGINE.' APPLIoAiIoN 'FII'.BD MAY 14, 1904.

2 SHEETS-SHEET 1 PATENTBDMAR. 21, 1905. L. BBRGMAN.

. 'ROTARY ENGINE.

IIIIIIIIIIIIIIII MAY 14,1904.

No. r785,077.

Patented March 21, 1905.

UNiTED STATES I )ATENT GFFICE.

LUDWIG BERGMAN, OF CASS LAKE, MINNESOTA-- ROTARY ENGINE.

SPECIFICATION forming part of Letters Patent No. 785,077, dated March21, 1905.

Application liel May 14, 1904. Serial No. 207,894.

1'0 (vf/J, r11/1.0711, it may concern/,-

Be it known that I, LUDWIG BnRGMAN, a citizen of the United States,residing at Cass Lake, in the county of Cass and State ofl Minnesota,have invented certain new and useful Improvements in Rotary Engines; andI do hereby declare the following to be a full, clear, and exactdescription of the invention, such as will enable others skilled in theart to which it appertains to make and 'use the same. I Y

My invention relates to rotary engines, and has for its object toimprove the same in the several particulars hereinafter noted.

The invention consists of the novel devices and combinations of deviceshereinafter described, and defined in the claim.

In the accompanying drawings, which illustrate my invention, likecharacters indicate like parts throughout the several views.

Figure 1 is a side elevation showing the complete engine. Fig. 2 is aplan viewV of the engine with the upper portion of the pistonseatcasting removed from working position and some parts being broken away.Fig. 3 is a detail in vertical section on the line ac3 x3 of Fig. 1.Fiffs. 4 and 4a are vertical sections taken on the line x4 904 of Fig.2, the section parts being turned one toward the left, the other towardthe right. Fig. 5 is a detail showing in plan view the rotary piston andits propelling-blade, some parts being broken away. Fig. 6 is a sideelevation of the parts shown in Fig. 5, and Fig. 7 is a plan viewshowing the propelling-blade removed from p working position.

The numeral 1 indicates the base, and the numeral 2 the top, of adivided piston-seat casting, which members are formed with supplementalsections of a spherical piston-seat 3. The said members 1 and 2 arejoined in a horizontal plane which intersects the center of thepiston-seat 3, and the said sections are provided with projecting lugs4, through which short nutted bolts 5 are passed to rigidly butdetachably connect the said two members. Members 1 and 2 are providedwith supplemental bearing-hubs 6, which are axially alined in ahorigontal plane at diametrically opposite points.

The piston-seat 3 is divided in two compartments or piston-seats properby a vertical dividing web or partition 7, formed in part on the member1 and in part on the member 2.

A horizontally-disposed shaft 8 extends to supplemental piston-seats andis journaled in the bearing-hub 6. This shaft 8 is provided with aspherical intermediate section 9, which closelyengages the seat formedin the oblique partition 7, and on the opposite sides of said partitionit is formed with conical piston-heads 10. The outer extremities ofthese piston-heads 10 closely iit the spherical walls of thesupplemental piston-seats 3,

"and the conical surfaces of these piston-heads engage tangentially onewith each side of the oblique partition 7', so that the said partitionis caused to serve as an abutment, as will presently more fully appear.The two piston-heads 10 and the intermediate con- `necting-ball 9 areslit, and working through this slit is an ap roximately circular ordiskinto a pair of supplemental propelling-blades which work one in eachof the supplemental piston-seats. As shown, the piston-shaft '8 isprovided with a pulley 13, from which motion may be transmitted througha belt. (Not shown.)

The oblique partition or abutment 7 at one extremity projects beyond thecasting 1 2 and is formed with two exhaust-ports 111 and twoadmission-ports 15. To the outer extremity 7a of the partition 7 isbolted or other wise secured a block 16, which is formed withexhaust-ports 17, with an admission-cavity 1S. 17 to suitable points ofexhaust. A steamsupply pipe 20 leadsfrom a source of steamsupply to thecavity 18. A reciprocating adlmission-valve 21 works between the workingseat formed between the abutting surfaces of the block 16 and of theabutment extension 7a. This valve is formed by a pair of ports 22, whichare so spaced that one Exhaust-pipes 19 lead from the ports IOC thereofwill register with one pair of alined exhaust-ports 14 17 when the otherregisters with one of the admission-ports 15 and the cavity 18, as shownin Fig. 3. As shown, the valve 21 is adapted to be moved into differentpositions by a bell-crank lever 23, which, as shown, is pivoted to a lug24 on the basecasting 1.

The upper ports 14 and 15 lead to a port 25, while the lower ports 14 15lead to a port 26, which ports 25 26 are formed entirely within theoblique abutment 7. The port 25 opens into the right-hand piston-seatabove the horizontal plane of its axis at 25a and as best shown in Fig.4a. The port 26 'opens into the left-hand piston-seat at 26a, whichportopening 26EL is located at a point nearly diametrically opposite tothe port-o ening 25a, but above the horizontal plane o the axis of thepiston-seat- (See particularly Fig. 4.) An intermediate port-opening 27runs through the lower portion of the oblique abutment 7 and opens atone end at 27 a into the righthand piston-seat below the port-opening25a. At its other extremity said port 27 opens into the left-handpiston-seat below the portopening 26a, as indicated at 27b in Fig.4.

The engine illustrated is a reversible compound engine; but it may beconstructed as a simple single engine.

Operation: ln view of the Obliquity of the abutment 7 with respect tothe axis of the piston 10 it of course follows that under rotation ofthe pistons the supplemental propelling-blades 11 will be oscillatedback and forth through the pistons. It also follows that when live steamis admitted, by the adjustment of the valve 21 as shown in Fig. 3,through the port 25 and into the right-hand piston-seat slightly abovethe line of tangential contact between the right-hand piston 10 and theabutment 7 the pistons will be rotated in the direction indicated by thearrows in Figs. 2, 4, and 4a. When the valve 21 is adjusted as shown inFig. 3, the passage of the steam after it has entered the right-handpisvton-seat, as above described, is as follows:

The steam acts upon the left-hand impellingblade 11 until the pistonshave made nearly one complete rotation and the impellingblade has passedthe port-opening 27 a,where upon the steam passes through saidportopening 27 a into the port 27 and is caused to travel backwardnearly but not quite the distance of a half-rotation and then enters theleft-hand piston-seat through the port 27h, which port is located belowthe horizontal plane of the axis of the piston. l The steam then acts onthe left-hand impelling-blade 11 during nearly the complete rotation ofthe pistons until after the said impelling-blade has passed theport-opening 26a, whereupon the steam is exhausted out through the port26, lower valve-port 22, lower exhaust-ports 14 22, and lowerexhaust-pipe 19. To reverse the engine, it is only necessary to move thevalve 21 downward, so as to open up the port 26 to live steam and theport 25 to exhaust, thereby causing the steam to travel a course justreversed from that previously traced.

From what has been said it will be understood that the engine describedis capable of many modifications within the scope of my invention asherein set forth and claimed. The device described as a rotary engineis, nevertheless, capable of use as a rotary pump when the pistonsthereof are positively driven by force applied to their shaft exteriorof the engine.

What l claim, and desire to secure by Letters Patent of the UnitedStates, is as follows:

In a rotary engine, the combination with a base member 1 and top member2, formed with an approximately spherical piston-seat 3, divided intocompartments by an oblique abutment 7, of the conical rotary pistons 10connected by a spherical head 9 and .having shaft extensions 8 journaledin said members 1 and 2, said pistons having tangential contact withsaid abutment 7 and said head 9 fitting a seat in said abutment, thedisk-like impelling-blade 11 working diametrically through said pistons10 and head 9, and notched at 12- to embrace said abutment 7, andsuitable admission and exhaust ports leading to and from the pistonseatcompartments, substantially as described.

In testimony whereof I affix my signature in presence of two witnesses.

LUDWIG BERGMAN.

Witnesses:

FRED W. SMITH, H. SELBERG.

IOO

